/*!	 trgt_png_spritesheet.h
**	 Sprite sheet render target.
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**  Copyright (c) 2013		Moritz Grosch (LittleFox) <littlefox@fsfe.org>
**  Copyright (c) 2015		Denis Zdorovtsov (mrtrizer) <mrtrizer@gmail.com>
**
**  Based on trgt_png.h
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
** === N O T E S ===========================================================
**
** ========================================================================= */

#ifndef __SYNFIG_TRGT_PNG_SPRITESHEET_H
#define __SYNFIG_TRGT_PNG_SPRITESHEET_H

#include <png.h>
#include <synfig/target_scanline.h>
#include <synfig/string.h>
#include <synfig/targetparam.h>
#include <cstdio>

class png_trgt_spritesheet : public synfig::Target_Scanline
{
    SYNFIG_TARGET_MODULE_EXT
private:
    struct PngImage {
        PngImage():
            width(0),
            height(0),
            color_type(0),
            bit_depth(0) {}
        unsigned int width;
        unsigned int height;
        png_byte color_type;
        png_byte bit_depth;
        png_structp png_ptr;
        png_infop info_ptr;
    };

    static void png_out_error(png_struct *png, const char *msg);
    static void png_out_warning(png_struct *png, const char *msg);
    bool ready;
    bool initialized;
    int imagecount;
    int lastimage;
    int numimages;
    unsigned int cur_y;
    unsigned int cur_row;
    unsigned int cur_col;
    synfig::TargetParam params;
    synfig::Color ** color_data;
    unsigned int sheet_width;
    unsigned int sheet_height;
    FILE * in_file_pointer;
    FILE * out_file_pointer;
    unsigned int cur_out_image_row;
    PngImage in_image;
    synfig::String filename;
    synfig::String sequence_separator;
    synfig::Color * overflow_buff;
public:
    png_trgt_spritesheet(const char *filename, const synfig::TargetParam& /* params */);
    virtual ~png_trgt_spritesheet();

    virtual bool set_rend_desc(synfig::RendDesc *desc);
    virtual bool start_frame(synfig::ProgressCallback *cb);
    virtual void end_frame();

    virtual synfig::Color * start_scanline(int scanline);
    virtual bool end_scanline();
    bool read_png_file();
    bool write_png_file();
    bool load_png_file();
};

#endif